1 /*
2 * SuperH Mobile SDHI
3 *
4 * Copyright (C) 2009 Magnus Damm
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Based on "Compaq ASIC3 support":
11 *
12 * Copyright 2001 Compaq Computer Corporation.
13 * Copyright 2004-2005 Phil Blundell
14 * Copyright 2007-2008 OpenedHand Ltd.
15 *
16 * Authors: Phil Blundell <pb@handhelds.org>,
17 * Samuel Ortiz <sameo@openedhand.com>
18 *
19 */
20
21 #include <linux/kernel.h>
22 #include <linux/clk.h>
23 #include <linux/slab.h>
24 #include <linux/mod_devicetable.h>
25 #include <linux/module.h>
26 #include <linux/of_device.h>
27 #include <linux/platform_device.h>
28 #include <linux/mmc/host.h>
29 #include <linux/mmc/sh_mobile_sdhi.h>
30 #include <linux/mfd/tmio.h>
31 #include <linux/sh_dma.h>
32 #include <linux/delay.h>
33
34 #include "tmio_mmc.h"
35
36 struct sh_mobile_sdhi_of_data {
37 unsigned long tmio_flags;
38 };
39
40 static const struct sh_mobile_sdhi_of_data sh_mobile_sdhi_of_cfg[] = {
41 {
42 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
43 },
44 };
45
46 struct sh_mobile_sdhi {
47 struct clk *clk;
48 struct tmio_mmc_data mmc_data;
49 struct sh_dmae_slave param_tx;
50 struct sh_dmae_slave param_rx;
51 struct tmio_mmc_dma dma_priv;
52 };
53
sh_mobile_sdhi_clk_enable(struct platform_device * pdev,unsigned int * f)54 static int sh_mobile_sdhi_clk_enable(struct platform_device *pdev, unsigned int *f)
55 {
56 struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
57 struct tmio_mmc_host *host = mmc_priv(mmc);
58 struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
59 int ret = clk_enable(priv->clk);
60 if (ret < 0)
61 return ret;
62
63 *f = clk_get_rate(priv->clk);
64 return 0;
65 }
66
sh_mobile_sdhi_clk_disable(struct platform_device * pdev)67 static void sh_mobile_sdhi_clk_disable(struct platform_device *pdev)
68 {
69 struct mmc_host *mmc = dev_get_drvdata(&pdev->dev);
70 struct tmio_mmc_host *host = mmc_priv(mmc);
71 struct sh_mobile_sdhi *priv = container_of(host->pdata, struct sh_mobile_sdhi, mmc_data);
72 clk_disable(priv->clk);
73 }
74
sh_mobile_sdhi_set_pwr(struct platform_device * pdev,int state)75 static void sh_mobile_sdhi_set_pwr(struct platform_device *pdev, int state)
76 {
77 struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
78
79 p->set_pwr(pdev, state);
80 }
81
sh_mobile_sdhi_get_cd(struct platform_device * pdev)82 static int sh_mobile_sdhi_get_cd(struct platform_device *pdev)
83 {
84 struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
85
86 return p->get_cd(pdev);
87 }
88
sh_mobile_sdhi_wait_idle(struct tmio_mmc_host * host)89 static int sh_mobile_sdhi_wait_idle(struct tmio_mmc_host *host)
90 {
91 int timeout = 1000;
92
93 while (--timeout && !(sd_ctrl_read16(host, CTL_STATUS2) & (1 << 13)))
94 udelay(1);
95
96 if (!timeout) {
97 dev_warn(host->pdata->dev, "timeout waiting for SD bus idle\n");
98 return -EBUSY;
99 }
100
101 return 0;
102 }
103
sh_mobile_sdhi_write16_hook(struct tmio_mmc_host * host,int addr)104 static int sh_mobile_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
105 {
106 switch (addr)
107 {
108 case CTL_SD_CMD:
109 case CTL_STOP_INTERNAL_ACTION:
110 case CTL_XFER_BLK_COUNT:
111 case CTL_SD_CARD_CLK_CTL:
112 case CTL_SD_XFER_LEN:
113 case CTL_SD_MEM_CARD_OPT:
114 case CTL_TRANSACTION_CTL:
115 case CTL_DMA_ENABLE:
116 return sh_mobile_sdhi_wait_idle(host);
117 }
118
119 return 0;
120 }
121
sh_mobile_sdhi_cd_wakeup(const struct platform_device * pdev)122 static void sh_mobile_sdhi_cd_wakeup(const struct platform_device *pdev)
123 {
124 mmc_detect_change(dev_get_drvdata(&pdev->dev), msecs_to_jiffies(100));
125 }
126
127 static const struct sh_mobile_sdhi_ops sdhi_ops = {
128 .cd_wakeup = sh_mobile_sdhi_cd_wakeup,
129 };
130
131 static const struct of_device_id sh_mobile_sdhi_of_match[] = {
132 { .compatible = "renesas,shmobile-sdhi" },
133 { .compatible = "renesas,sh7372-sdhi" },
134 { .compatible = "renesas,r8a7740-sdhi", .data = &sh_mobile_sdhi_of_cfg[0], },
135 {},
136 };
137 MODULE_DEVICE_TABLE(of, sh_mobile_sdhi_of_match);
138
sh_mobile_sdhi_probe(struct platform_device * pdev)139 static int sh_mobile_sdhi_probe(struct platform_device *pdev)
140 {
141 const struct of_device_id *of_id =
142 of_match_device(sh_mobile_sdhi_of_match, &pdev->dev);
143 struct sh_mobile_sdhi *priv;
144 struct tmio_mmc_data *mmc_data;
145 struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
146 struct tmio_mmc_host *host;
147 int irq, ret, i = 0;
148 bool multiplexed_isr = true;
149
150 priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
151 if (priv == NULL) {
152 dev_err(&pdev->dev, "kzalloc failed\n");
153 return -ENOMEM;
154 }
155
156 mmc_data = &priv->mmc_data;
157
158 if (p) {
159 if (p->init) {
160 ret = p->init(pdev, &sdhi_ops);
161 if (ret)
162 return ret;
163 }
164 }
165
166 priv->clk = devm_clk_get(&pdev->dev, NULL);
167 if (IS_ERR(priv->clk)) {
168 ret = PTR_ERR(priv->clk);
169 dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
170 goto eclkget;
171 }
172
173 mmc_data->clk_enable = sh_mobile_sdhi_clk_enable;
174 mmc_data->clk_disable = sh_mobile_sdhi_clk_disable;
175 mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
176 mmc_data->write16_hook = sh_mobile_sdhi_write16_hook;
177 if (p) {
178 mmc_data->flags = p->tmio_flags;
179 mmc_data->ocr_mask = p->tmio_ocr_mask;
180 mmc_data->capabilities |= p->tmio_caps;
181 mmc_data->capabilities2 |= p->tmio_caps2;
182 mmc_data->cd_gpio = p->cd_gpio;
183 if (p->set_pwr)
184 mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
185 if (p->get_cd)
186 mmc_data->get_cd = sh_mobile_sdhi_get_cd;
187
188 if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
189 priv->param_tx.shdma_slave.slave_id = p->dma_slave_tx;
190 priv->param_rx.shdma_slave.slave_id = p->dma_slave_rx;
191 priv->dma_priv.chan_priv_tx = &priv->param_tx.shdma_slave;
192 priv->dma_priv.chan_priv_rx = &priv->param_rx.shdma_slave;
193 priv->dma_priv.alignment_shift = 1; /* 2-byte alignment */
194 mmc_data->dma = &priv->dma_priv;
195 }
196 }
197
198 /*
199 * All SDHI blocks support 2-byte and larger block sizes in 4-bit
200 * bus width mode.
201 */
202 mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
203
204 /*
205 * All SDHI blocks support SDIO IRQ signalling.
206 */
207 mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
208
209 if (of_id && of_id->data) {
210 const struct sh_mobile_sdhi_of_data *of_data = of_id->data;
211 mmc_data->flags |= of_data->tmio_flags;
212 }
213
214 ret = tmio_mmc_host_probe(&host, pdev, mmc_data);
215 if (ret < 0)
216 goto eprobe;
217
218 /*
219 * Allow one or more specific (named) ISRs or
220 * one or more multiplexed (un-named) ISRs.
221 */
222
223 irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_CARD_DETECT);
224 if (irq >= 0) {
225 multiplexed_isr = false;
226 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_card_detect_irq, 0,
227 dev_name(&pdev->dev), host);
228 if (ret)
229 goto eirq;
230 }
231
232 irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDIO);
233 if (irq >= 0) {
234 multiplexed_isr = false;
235 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdio_irq, 0,
236 dev_name(&pdev->dev), host);
237 if (ret)
238 goto eirq;
239 }
240
241 irq = platform_get_irq_byname(pdev, SH_MOBILE_SDHI_IRQ_SDCARD);
242 if (irq >= 0) {
243 multiplexed_isr = false;
244 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_sdcard_irq, 0,
245 dev_name(&pdev->dev), host);
246 if (ret)
247 goto eirq;
248 } else if (!multiplexed_isr) {
249 dev_err(&pdev->dev,
250 "Principal SD-card IRQ is missing among named interrupts\n");
251 ret = irq;
252 goto eirq;
253 }
254
255 if (multiplexed_isr) {
256 while (1) {
257 irq = platform_get_irq(pdev, i);
258 if (irq < 0)
259 break;
260 i++;
261 ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
262 dev_name(&pdev->dev), host);
263 if (ret)
264 goto eirq;
265 }
266
267 /* There must be at least one IRQ source */
268 if (!i)
269 goto eirq;
270 }
271
272 dev_info(&pdev->dev, "%s base at 0x%08lx clock rate %u MHz\n",
273 mmc_hostname(host->mmc), (unsigned long)
274 (platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
275 host->mmc->f_max / 1000000);
276
277 return ret;
278
279 eirq:
280 tmio_mmc_host_remove(host);
281 eprobe:
282 eclkget:
283 if (p && p->cleanup)
284 p->cleanup(pdev);
285 return ret;
286 }
287
sh_mobile_sdhi_remove(struct platform_device * pdev)288 static int sh_mobile_sdhi_remove(struct platform_device *pdev)
289 {
290 struct mmc_host *mmc = platform_get_drvdata(pdev);
291 struct tmio_mmc_host *host = mmc_priv(mmc);
292 struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
293
294 tmio_mmc_host_remove(host);
295
296 if (p && p->cleanup)
297 p->cleanup(pdev);
298
299 return 0;
300 }
301
302 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
303 .suspend = tmio_mmc_host_suspend,
304 .resume = tmio_mmc_host_resume,
305 .runtime_suspend = tmio_mmc_host_runtime_suspend,
306 .runtime_resume = tmio_mmc_host_runtime_resume,
307 };
308
309 static struct platform_driver sh_mobile_sdhi_driver = {
310 .driver = {
311 .name = "sh_mobile_sdhi",
312 .owner = THIS_MODULE,
313 .pm = &tmio_mmc_dev_pm_ops,
314 .of_match_table = sh_mobile_sdhi_of_match,
315 },
316 .probe = sh_mobile_sdhi_probe,
317 .remove = sh_mobile_sdhi_remove,
318 };
319
320 module_platform_driver(sh_mobile_sdhi_driver);
321
322 MODULE_DESCRIPTION("SuperH Mobile SDHI driver");
323 MODULE_AUTHOR("Magnus Damm");
324 MODULE_LICENSE("GPL v2");
325 MODULE_ALIAS("platform:sh_mobile_sdhi");
326